Feeding formula while travelling in car using spoon

Hi all, I will be travelling soon to my home after staying at my mom’s for first three months via car. Journey will be around 7-8 hours. My LO will be 3+ months during that time. We currently combo feed. I breastfeed and then give him formula via spoon. Any suggestions on how to feed him formula while travelling in car. Even if I switch to bottle, how do I prep for bottle in car and which bottle do I use?